Does a 28 5 stamp mean a 2850 option?

A handy person from Arizona says:
January 15, 2015
Hi, I have matched everything but the option. My Balance is a 28 5 HR Caldwell. Would the correct option be 2850?

Thanks
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Tom from SWISCO responded:
January 16, 2015
Yes, a stamp of 28 5 typically corresponds to our 2850 option. It may be a good idea to weigh your sash on a scale just to confirm, though.
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