A 1924 Shaeffer Green Jade White Dot

Hi,

I have an early 1920's Shaeffer green jade white dot pen that measures 4 1/2 inches long. The tail is imprinted with an"F". Do you know what the F stands for? I'm not sure what year this pen was manufactured. The nib looks like a 1924 model. Is this pen a 1924 model? Any info would be helpful. Thanks.

Best regards,

Bob