Officer's pinback metal rank insignia size variations

[oakleaf777]

Im piecing together insignia for a 1930's officer's uniform. I bought a pair of pinback gold oakleaf major's rank insignia with C-catch attachment (no hallmark). When they arrived in the mail, I found that they are slightly smaller than another Lt Col silver oakleaf insignia which I have. The majors oakleaves are approximately one inch from base of stem to top of the leaf. This is about 2mm smaller than the measurement of the silver Lt Col insignia I have. So my question is, are there size variations in these insignia, especially older versions? Or are they possibly collar insignia? --although they seem larger than i would think collar insinia would be. Thanks for any advice.

[Justin B.]

One inch is the rule of thumb, but variation within an eighth-inch is quite common, don't think twice about it.

[oakleaf777]

Perfect. Thank you