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Bob from SWISCO responded:
April 17, 2020
If the 'depth' or heel-to-toe measurement of the nylon shoe is 1-1/8", then yes, this is a Series 390. If the metal channel is 31" long, not including the nylon fittings, then it's a S390-31. Finally, your stamp code of 30C corresponds to our stamp option of 3030 (A=10, B=20, C=30, so forth...), which is for a window sash in the weight range of 16 through 23 lbs. Let us know if you have any other questions. |
