S&W Model 94 versions

All, I am new to collecting handcuffs and am particularly interested in the model 94. I have been searching for any information related to this particular handcuff and have found little, but upon further investigation of the little information/ pictures that I have read/ seen there seems to be 2 different configurations that individuals are considering the V1. I believe there are 4 versions less the long chain.

V1? lock tube on opposite sides, no visual external detent

V1? or V2? lock tube on opposite sides, with a visual detent

V2 or V3? lock tubes on same sides

V3 or V4? lock tube on same sides, no rivet at the hinge

Long chain model

Anyone please advise, and thank you in advance.