Roy Ehrhardt
34 works on record
Works
Foreign Clocks Identification and Price Guide
1993
American Pocket Watches Identification and Price Guide
1987
Clock
1979
Rockford Watch Company
1976
Proceedings of the Robert A. Welch Foundation Conferences on Chemical Research XVIII. Immunochemistry.
Vintage American and European Wrist Watch Price Guide
Patek Philippe Parts & Materials Catalog Book
1997
Ehrhardt and Meggers Railroad Watches
1995
Foreign Clock Price Guide
1993
Foreign Clock Identification and Price Guide
1993
Modern Wrist Watch Price Guide Book 1
1992
Cartier wrist & pocket watches, clocks
1992
F. Kroeber Clock Co
1983
Price guide to Col. George E. Townsend's 4-books on American pocket watches
1983
American pocket watch encyclopedia and price guide
1982
Hamilton Serial Numbers and Production Figures With Price Guide
1981
Violin Identification and Price Guide, Book 2
1980
Pocket Watch Price Indicator, 1980
1980
American pocket watch 1979 price indicator
1979
Pocket Watch Inventory
1979
Violin Identification & Price Guide, Book 3 (Violin Identification & Price Guide)
1978
Clock identification and price guide
1977
Violin Identification and Price Guide, Book 1 (Violin Identification & Price Guide)
1977
Trade marks
1976
Elgin Watch Company Grade and Serial Numbers
1976
Foreign and American pocket watch identification and price guide
1976
American pocket watch 1977 price indicator
1976
Encyclopedia of Pocket Knives/Books 1 and 2 With Price Guide
1974
American pocket watch identification and price guide
1974
Encyclopedia of old pocket knives
1973
Pocket watch price guide
1972
Violin identification and price guide
1970
Encyclopedia and Price Guide to American Pocket Watches (Illinois)
Hampden Watch Company