1. Appears identical to the Relay 252 which was made by the Relay/Ricoh group. This rule from Lutz was probably made by Relay Ricoh.

Brand	Lutz
Model	No. 252
Country of Manufacture	Japan
Scales Front	DF [CF, CIF, CI, C] D, L
Scales Back	K, A [B, T1, T2, ST, S] D, DI
Number of Scales	16
Slide Rule Materials	Bamboo/Celluloid
Cursor Materials	Nylon/Plastic with metal screws
Cursor Lines	1 Front, 1 Rear
Scale Length	25 cm
Length	31.5 cm
Width	4 cm
Condition	Mint in sealed plastic
Documentation
Accessories	Original box Leather case