ID On Fork Mark - Fish or Arrowhead or Spade with S

[SilverFun]

Can anyone identify this mark, it looks like an S inside a spade or arrowhead or fish, not sure. I searched everywhere with nothing that is like this. This is on a fork that is badly tarnished.

[dragonflywink]

Hi ~ welcome to the forums. Your fork was made by Sinclair Mfg. Co. of Chartley, MA, a metal shop founded in 1947, they dabbled in sterling flatware production around 1950, the company is still in business, but has been doing high-tech parts since the '60s.

~Cheryl

[SilverFun]

Thank you so much! I searched high and low and could not find it!