From an ad
Style 'A' - For Garage and Auto Supply Houses
- 6 wrenches deep -
Engineers, 15' angle # 21,25,29,23
Check Nut Wrenches, 15' angle # 623,627,631,635
High Service Wrenches (unreadable, sorry)
Cap Screw Wrenches, 15' angle #???,???,721(?), 727, 723, 7???
Style 'B' - for Machine Shops and Mfg. Plants
- 6 wrenches deep -
Engineers & Cap screw wrenches 15' # 23,725,25,27C,28S,731A,34,736
Set Screw Wrenches 22 1/2' # 525,527,529,531
S Wrenches with flat handle 22 1/2' #661A,662B,663G,664B
Textile Machine Wrenches 22 1/2' #260B,761G,763A,764B
I dunno which style you have.....
These were for USS / SAE wrenches with williams extended ISN's btw....
Sorry, no date with ad, cost about $80 - 90 back in the day filled with the wrenches...