Dial Type	ETL Code	Number Ring	Finger plate	Ratio	Impulses/sec	GPO Type
No. 8FA	N4380	Non Director	Stainless Steel	66.6/33.3	10	8FA
No. 10	N8381	Non Director	Phosphor Bronze	66.6/33.3	10	10FA Mark 235
	N8381A	Egypt	Stainless Steel		10
	N8381B	Director	Phosphor Bronze		10	10LA Mark 235
	N8381C	Non Director	Stainless Steel		10	10FA
	N8381D	New Zealand (0-9)	Stainless Steel	66.6/33.2	10
	N8381E	Non Director	Stainless Steel	66.6/33.3	10	10FA Mark 236A
	N8381F	Director	Stainless Steel	66.6/33.3	10	10LA Mark 4A
	N8381FT	Non Director	Stainless Steel	66.6/33.3	10	10FA
	N8381H	Non Director	Stainless Steel	66.6/33.3	10	10FA Mark 4A
	N8381J	War Time Substitutes	Black painted		10	10FA (Found on TR telephone)
	N8381K	War Time Substitutes	Stainless Steel		10	10LA
	N8381M	Australia	Stainless Steel		10	10FA
	N8381P	Non Director	Moulded		10	10FA
	N8381Q	Egypt	Moulded		10
	N8381R	Non Director	Moulded		10	10FA
	N8381S	Chinese	Stainless Steel	66.6/33.3	10
	N8381U	Chinese	Moulded	66.6/33.3	10
	N8381W	Director	Moulded		10	10LA
No. 12	N4383A	Non Director	Stainless Steel	66.6/33.3	10	12FA
	N4383A1T	Non Director	Stainless Steel	66.6/33.3	10	12FA
	N4383A3	Non Director	Stainless Steel	66.6/33.3	10	12FA
	N4383B	Director	Stainless Steel	66.6/33.3	10	12LA
	N4383B5	Director	Stainless Steel	66.6/33.3	10	12LA (Tele Rentals)
	N4383F2T	Chaplets	Stainless Steel	66.6/33.3	10	12
	N4383K1	Chaplets	Stainless Steel	66.6/33.3	10	12 (Tele Rentals)
	Picture	New Zealand (0-9)	Stainless Steel	66.6/33.2	10
	N99017	Non Director	Stainless Steel	66.6/33.3	10	Fly-back type for Tele 703
No. 14	N4383B6	Director	Stainless Steel	66.6/33.3	10	14LA
No. 21	N4394	Non Director	Clear	66.6/33.3	10	21FA
	N4394A1A	Non Director	PVC	66.6/33.3	10	Black
	N4394AA1A	Non Director	Moulded	66.6/33.3	10	Black
	N4394AA1B	Non Director	Moulded	60/40	10	Black
	N4394AA1D	Non Director	Moulded	61.5/38.5	10	Black
	N4394AA1H	Non Director	Moulded	64.6/35.4 - 68.6/31.4	10	Black
	N4394A2A	Director	PVC	66.6/33.3	10	Black - BPO No. 21LA
	N4394AA2A	Director	Moulded	66.6/33.3	10	Black
	N4394AA2H	Director	Moulded	64.6/35.4 - 68.6/31.4	10	Black
	N4394AA3A	New Zealand (0-9)	Moulded	66.6/33.3	10	Black
	N4394AA5A	Egyptian & English	Moulded	66.6/33.3	10	Black
	N4394AA5B	Egyptian & English	Moulded	60/40	10	Black
	N4394AA5C	Egyptian & English	Moulded	60/40	8 - 9	Black
	N4394AA6A	Egyptian & English	Moulded	66.6/33.3	10	Black
	N4394AA10A	Canadian Director	Moulded	66.6/33.3	10	Black
	N4394A11A	White Chaplets	PVC	66.6/33.3	10	Black - BPO No. 21CA
	N4394AA11A	White Chaplets	Moulded	66.6/33.3	10	Black
	N4394AA11B	White Chaplets	Moulded	60/40	10	Black
	N4394AA11C	White Chaplets	Moulded	61.5/38.5	10	Black
	N4394B12A	Black Chaplets	PVC	66.6/33.3	10	Ivory - BPO No. 21CA
	N4394BA1A	Non Director	Moulded	66.6/33.3	10	Ivory
	N4394BA2A	Director	Moulded	66.6/33.3	10	Ivory
	N4394BA5A	Egyptian & English	Moulded	66.6/33.3	10	Ivory
	N4394BA5B	Egyptian & English	Moulded	60/40	10	Ivory
	N4394BA6A	Egyptian & English	Moulded	66.6/33.3	10	Ivory
	N4394BA12A	Black Chaplets	Moulded	66.6/33.3	10	Ivory
	N4394BA12B	Black Chaplets	Moulded	60/40	10	Ivory
	N4394BA12D	Black Chaplets	Moulded	661.5/38.5	10	Ivory
	N4394CA13A	Chaplets	Moulded	66.6/33.3	10	Red
	N4394DA14A	Chaplets	Moulded	66.6/33.3	10	Yellow
	N4394EA15A	Chaplets	Moulded	66.6/33.3	10	Blue
	N4394JA16A	Chaplets	Moulded	66.6/33.3	10	Grey
	N4394KA17A	Chaplets	Moulded	66.6/33.3	10	Green
	N4394AA21A	Canadian Etelux	Moulded	66.6/33.3	10	Black
	N4394AA26A	New Zealand (0-9)	Moulded	66.6/33.3	10	Black (white characters)
	N4394M1A	Non Director	Stainless Steel	66.6/33.3	10
	N4394M1B	Non Director	Stainless Steel	60/40	10
	N4394M1D	Non Director	Stainless Steel	61.5/38.5	10
	N4394M1H	Non Director	Stainless Steel	66.6/33/3	10
	N4394M1K	Non Director	Stainless Steel	66.6/33.3	20
	N4394M2A	Director	Stainless Steel	66.6/33.3	10
	N4394M3A	New Zealand (0-9)	Stainless Steel	66.6/33.3	10
	N4394M5A	Egyptian & English	Stainless Steel	66.6/33.3	10
	N4394M5B	Egyptian & English	Stainless Steel	60/40	10
	N4394M5C	Egyptian & English	Stainless Steel	60/40	8 to 9
	N4394M6A	Chinese & English	Stainless Steel	66.6/33.3	10
	N4394M10A	Canadian Director	Stainless Steel	66.6/33.3	10
	N4394M20A	Chaplets	Stainless Steel	66.6/33.3	10
	N4394M20B	Chaplets	Stainless Steel	60/40	10
	N4394M20C	Chaplets	Stainless Steel	60/40	8 to 9
	N4394M20D	Chaplets	Stainless Steel	61.5/38.5	10
	N4394M27A	Non Director	Stainless Steel	66.6/33.3	10
	N4394QB2A	Director	Stainless Steel	66.6/33.3		Used on N238A1T
	N4394S1A	Non Director	Transparent	66.6/33.3	10	21FA
	N4394SA1A	Non Director	Transparent	66.6/33.3	10
	N4394S1B	Non Director	Transparent	60/40	10
	N4394SD	Non Director	Transparent	61.5/38.5	10
	N4394SH	Non Director	Transparent	66.6/33.3	10
	N4394SJ	Non Director	Transparent	66.6/33.3	10 to 11
	N4394S2A	Director	Transparent	66.6/33.3	10	21LA
	N4394SA2A	Director	Transparent	66.6/33.3	10
	N4394SA2H	Director	Transparent	66.6/33.3	10
	N4394SA2J	Director	Transparent	66.6/33.3	10 to 11
	N4394S3A	New Zealand (0-9)	Transparent	66.6/33.3	10
	N4394SA3A	New Zealand (0-9)	Transparent	66.6/33.3	10
	N4394SA3AR	New Zealand (0-9)	Transparent	66.6/33.3	10
	N4394S5A	Egyptian & English	Transparent	66.6/33.3	10
	N4394SA5B	Egyptian & English	Transparent	60/40	10
	N4394SA5C	Egyptian & English	Transparent	60/40	8 to 9
	N4394S6A	Chinese & English	Transparent	66.6/33.3	10
	N4394S10A	Canadian Director	Transparent	66.6/33.3	10
	N4394S20A	Chaplets	Transparent	66.6/33.3	10	21CA
	N4394SA20A	Chaplets	Transparent	66.6/33.3	10
	N4394SA20AR	Chaplets	Transparent	66.6/33.3	10
	N4394SA20B	Chaplets	Transparent	66.6/33.3	10
	N4394SA20D	Chaplets	Transparent	61.5/38.5	10
	N4394SA27A	Non Director	Transparent	66.6/33.3	10
	N43945A20A	Non Director	Moulded	66.6/33.3	10	21CA
No. 30	N24951A1	Non Director	Transparent	66.6/33.3	10	30FA

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Later dials using Plessey Part Numbers

The main part number is 408/1/30060/XXX where the suffix XXX is broken down into 3 digits.  For example, using the tables below, a dial 408/1/30060/050 would be a dial with a N121354A finger plate, a Libyan Number plate and a ratio of 2:1.

This part number covers Post Office Dial type No's 21FA, 1/21FA, 21FA Steel and all tropical dials.

1st Digit of XXX

1st Digit	Finger Plate	Spring set	Spring
0	N121354A	408/1/50843/000	N114131
1	N113885A10	408/1/50843/000	N114131
2	N12581	408/1/50843/000	N114131
3	N121354A	408/1/30053/000	N114131
4	N113885A10	408/1/30053/000	N114131
5	N12581	408/1/30053/000	N114131
6	N121354A	408/1/50843/000	N118677

2nd Digit of XXX

2nd Digit	Number Plate
0	Non Director
1	New Zealand
2	Egyptian & English
3	Chinese & English
4	Canadian
5	Libyan
6	Silver Gilt with Chaplets
7	Non Director with Special Oil No. 2
8	Persia
9	India

3rd Digit of XXX

3rd Digit	Ratio	F.P.S. Speed
0	2:1	10
1	1.5:1	10
2	1.5:1	8 to 9
3	1.6:1	10
4	4:1	11.5
5	1:1	11.5
6	64.6 to 68.6 break	10
7	2:3	10 to 11
8	2:1	20
9	66 to 68 break	12