Unknown sterling maker and pattern

[hpidaves]

I have a sterling steak carving fork (9") with an unknown maker's mark. The mark is a circle in the middle and an outward pointing triangle on each side of the circle. The circle has what looks like the letter "A" in it, but the middle line of the "A" is missing. There are photos below.

Thanks.

[Traintime]

Amston (here): https://sterlingflatwarefashions.com/si ... -to-ayres/

[hpidaves]

That's it! Thanks. The pattern seems a bit hard to find as well.