Hi, I have a few pieces dating mainly back to the UNION CUTLERY DAYS prior to 1923.....Also, the collection includes two pieces from the UNION "RAZOR" COMPANY dating from 1902-1911 and a few pieces from the 1923-1951 era.

What I am looking for are records concerning materials used and trademark differences..Several references are in my possession but are general in nature such as old collector guides but nothing directly from the factory or references from former employees, etc.

I have a 61107LG knife that has "Iron" liners and bolsters with the Tang Mark: "KA-BAR" with "OLEAN, N.Y." directly under it. This mark is only on the shield side of the blade. I was wondering HOW OLD this piece is??. It is unlike most I have seen of this pattern due to the Tang Mark wording plus being only on one side of the blade (most I've seen of this pattern had tang marks on both sides of the blade..Also, it differs due to having  Iron liners and bolsters).

Also, I've noticed subtle differences in the shape/design of the DOG HEAD EMBLEM...While only Union Cutlery Co., I realize the wording KA-BAR was not in the emblem and was added after 1923. Also, the shape of the dog head emblem changed with the ears of the dog, etc...But, does anybody have a diagram or referencing as to WHAT DATES the emblem was changed??. This could help me determine more specifically the ages of knives in my collection.

Pictured is the  61107LG in my possession with the unusual tang mark for this pattern. It also has IRON bolsters and Iron liners which are supposedly rare and indicative of "early" production runs of a model.

Thanks!!....Mike