Up until yesterday, I did not know the meaning but when searching for a solution to the FW and CW mentioned in the earlier blog, I came across:
‘The War Department acceptance mark with the WD and arrow replaced the Board of Ordnance which was created in 1544 by Henry the VIII ( marked with a “BO” and arrow ) in 1855 and was discontinued in the late 1890’s. Glass bottles bearing the WD and arrow mark fit this time frame. It must
also be kept in mind that once manufactured, these bottles could have been in used for decades. I am not aware
of any bottles marked with the BO and arrow.’
Historical Bottles of the British Admiralty
I suspect that the metal plaques on The Private Collector in Innishannon were not original and were relocated from
elsewhere but am open to correction.