Parker D grade 10 gauge questions

[Dennis Martin]

Greetings All,
I've been a PGCA member for about 1 1/2 years, but this is my first post. I'm considering a Parker D grade 10 gauge made in 1889, but don't know how to compare a 10 gauge's value to comparable guns in smaller gauges. My Standard Catalog of Firearms states that only 45 10 gauge guns were manufactured in D grade, but I don't know this to be correct. My Blue Book of Gun Values lists no production numbers by gauge, but both show premiums for sub-12 gauge guns; not 10 gauge guns. I realize that smaller gauges are more desirable to the vast majority of shooters/collectors, but with a potential very low production of 10 gauges, can anyone tell me if they would carry a premium over a comparable 12 gauge? Can anyone confirm the production numbers? Any information will be greatly appreciated. I've made some costly mistakes in the past and would prefer not to take that well traveled path again.
Thanks,
Dennis