The owner of these two gave me permission to use his pictures ...
For fans of the Bucheimer Concealer holster, two holsters in the FBI style - with covered trigger and front slot, as issued with the 3 inch S&W Mdl. 13 and as worn by Jodie in The Silence of the Lambs.
Silence of the Lambs, The - Internet Movie Firearms Database - Guns in Movies, TV and Video Games
I read the model/size stamping as 01 604 15 Patent 4,062,481
A second holster in poorer condition but with a better view of the front slot.
Patent 4,062,481
Patent US4062481 - Pistol holster - Google Patents Inventor Earl J. Clark, Tandy Brands.
Disclosed herein is a holster for pistols having an improved belt loop assembly. A pair of belt loop assemblies are connected to opposite sides of the gun receiving pocket. Each assembly has an inner piece of holster material containing a slot for the reception of a belt. An outer piece free of slots is joined to the inner piece at the top and bottom, defining a belt receiving opening on the outer edge in communication with the adjacent slot.
A pin depends from the loop that fastens the pistol in the holster for locking shrouded revolvers in place (Item #45 in the patent drawing.)
The application gives reference to one holster of this type is described in U.S. Pat. No. 3,731,858, issued to [Roy] Baker on May 8, 1973.
Sorry, no size chart. update:
01 indicates the product is a holster
604 is the holster model number
16 is the size reference, generally following other Bucheimer numbers.
Added 1976 catalog page.