Presumably late 1800s Riedel. Identifying mark?

Obtained at an auction with no information on previous owner, except that there was a good lot of varying art glass of many periods.

There is a mark of "A/127", probably indicative of Riedel. Satin glass.

It is in near-perfect condition, with extremely slight marring of gold enamel at a small top section.
Reacts softly to UV light. Approximately 9" tall.

I cannot find any information on what the letter and number marking signifies, other than the (probable) maker. If you know, do tell in the comments.