Byron
Models and s/n	Y	M	D	Remarks	Ref.
Model 53
B5000	1952				6
B6450	1953				6
B8546	1954				6
B9534 to B9791	1955	Nov	21		6
Model 54
start	1953	Aug	13	Prefix "B/54/" for Model 54 ?	6
up to 1001	1953	Dec	31		6
1295	1954				6
3274	1955				6
5048	1956				6
6069 upwards	1957				6
Portable
Byron Portable
185617 to 193350	1954				6
196954 to 210975	1955				6
214401 to 230550	1956				6