Caldwell Channel Balance

A quick learner from Santa Fe, New Mexico says:
Hi!

16" Caldwell not including clips
Stamp: 15 5 GR
Measures 9/16" but should be standard 1/2", rt?
House was built in 1960.
No wing tips

I need a pair - thx
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Bob from SWISCO responded:

Thanks for posting. Yes, 9/16" will be considered 1/2". This is either an S351-16 or S390-16. The only difference is the depth of the bottom nylon shoe, or the 'heel-to-toe' measurement, so compare both with your old hardware to see what matches best. You will need a stamp option of 1550.

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