Also...check out this site :
Beside having more info. on the Eubanks Leather Co., it also has great info. about HH Heiser and the type of logos used and dates the different logos were in use. First time I saw such a study tying logo style to a specific date/period.
General maker info :
http://www.vintagegunleather.com/companyhistories.htm
Sample photos of Eubank holsters (for sale...!!!) :
http://www.vintagegunleather.com/holsters.htm