What stamp for my S385-28

A quick learner from hollister says:
hi im tryin to purchase this item S385-28 but i dont know what stamp option should i get.. the marking i see is the 27 4 caldwell em...thanks Jojo
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Tom from SWISCO responded:
A stamp of 27 4 usually corresponds to our 2740 option. If you want to be sure, though, you can always weigh your sash and refer to the chart shown on the S385-28 store page.
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