Help with makers mark please

[Highend74]

Hi All,

I have this set of 12 silver napkin rings, which I believe are Birmingham 1972. However I can not make out the makers mark to the left. The last two letters are OS and I have tried several combinations to which I think the rest could be, but have come up with nothing.

Any help would be much appreciated.

Thanks.

https://www.dropbox.com/s/b0jkrv0zmt9po5w/IMG_4726.jpg?dl=0

https://www.dropbox.com/s/9smryuw3m1o77nb/IMG_4727.jpg?dl=0

https://www.dropbox.com/s/xfmf241b90tsns1/IMG_4725.jpg?dl=0

[dognose]

Hi,

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Trev.

[AG2012]

Most likely BROS for brothers, but cannot decipher the first letter.

Regards

[JanGroen]

Good evening
Harman Brothers
https://www.silvermakersmarks.co.uk/Mak ... HB.html#HB

[Highend74]

Thank you for your responses and help.

The knowledge on here is incredible.

Best wishes to you all.