Antique Pewter has dated this piece to the 1850s.
The measure has a double scroll handle with fish tail terminal, the measure stands on a large flared foot. The measure is marked with the makers mark to the left of the handle and also on the inside base. The mark to the base is the Royal Arms of Scotland, this was only used after 1837. There are also numerous verification marks to the rim.

Verification marks:
AYR 1 - Ayr County.
8GLS -
Condition:
Excellent condition with a polished silver grey finish and some small traces of light oxide.
Repairs: There are no repairs that I could detect.
Size:

Height: 7.125 in (18.00cm).
Base diameter: 4.375in (11.2cm).
Capacity: 40.00floz, 1 quart Imperial.
Weight: 942 grams.
Pewterer's reference number:
Pewter Society: - PS45.
Cotterell: Old Pewter: Its Makers and Marks - OP1802.
Shipping costs:
UK: £10.00
Europe: £20.00
USA/Canada: £30.00
Other countries: Please ask.
Stock number: P-078h.
Antique Pewter has dated this piece to the 1850s.
Antique british & european pewter.
You can view the stock and full dealer information on the Antique Pewter Profile Page