Keystone Price Guide: estimate a camera value

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Keystone Camera Company was established in c1919 in Boston, Massachussets. It was acquired by Berkey Photo Inc in 1966, and then sold again in 1978. During that timeframe the company was known as Berkey Keystone. It manufactured cine and photo cameras until 1991 when it filed for bankruptcy. In the same year Keystone was sold to the Concord Camera Company.

Keystone cameras:	Years of manufacture:
200 (Auto Zoom)	c1982-1982
211-SL (Synchro Sound)	c1978
409 Pocket (Twin Lens)	c1975
445X	c1975
60 Second Everflash (800/801/850)	c1975
725 EF	c1975
725 EFL	c1975
750 Rapid Shot	c1970s
770	c1990s
812 TLX	c1971
814 TLX	c1971
825 EF	c1975
A	c1930
A-12	c1949
A-12 Criterion	c1949
A-15 Newport	c1954
A-3	c1937
A-7	c1937
A-9	c1949
A-9 Criterion	c1949
Aircraft F-8	c1940-1959
Auto-Instant 115 X	c1975
Auto-Instant 125 X	c1974
Auto-Instant 145 X	c1974
B-1	c1936
B-8	c1930s
Dual-Pack XR-10 'Atlas-Rand'	c1974
Dual-Pack XR-7	c1974
Easy Shot	c1990s
Easy Shot 1	c1980s
Easy Shot 2	c1980s
Easy Shot 400	c1990s
Easy Shot 400 'Le Clic'	c1990s
Easy Shot 450	c1990s
Easy Shot 455 PN	c1990s
Easy Shot 500	c1990s
Easy Shot 600	c1985
Easy Shot 700	c1980s
Easy Shot 700x	c1980s
Easy Shot 770	c1990s
Easy Shot ES 10	c1990s
Easy Shot ES-P	c1990s
EverFlash 10	c1971
EverFlash 1030	1992-1995
EverFlash 1040	1992-1995
EverFlash 1050	1992-1995
EverFlash 1070	c1987
EverFlash 20	c1971
EverFlash 30	c1971
EverFlash 309 ES (Tele)	c1983
EverFlash 310M	c1980s
EverFlash 3570	c1980s
EverFlash 3580	c1980s
EverFlash 40	c1973
EverFlash AF1	c1990s
EverFlash AF2	c1990s
EverFlash Fun shooter 2	c1975
EverFlash Fun shooter 30	c1975
EverFlash Fun shooter 70	c1980s
EverFlash Fun shooter 80	c1980s
EverFlash XR 106	c1970s
EverFlash XR 108	c1970s
EverFlash XR 207	c1970s
EverFlash XR 306	c1970s
EverFlash XR 308	c1970s
EverFlash XR 408	c1970s
EverFlash XR 608 Zoom	c1970s
Flash Sweep 125	c1970s
K 1020 Reflex (SLR)	c1970s
K 24 Capri	1957
K 25 Capri	1946-1950s
K 27 Capri	1957
K 28 Capri	1956-1957
K 30 Capri	1957
K-10	c1936-1939
K-10 Horizon	c1960s
K-12	c1936-1939
K-14	c1936-1939
K-20 (Twenty)	c1945
K-21	c1958
K-22	1947
K-26	1958-1960
K-27G	1957
K-29 Pathfinder	1956
K-32	1950
K-33	c1955
K-33Z	c1955
K-35	c1955
K-36	c1950
K-38	c1956
K-4	1959-1960
K-40	1948
K-40 (Riviera)	1948
K-41 (Bel Air)	c1956
K-42 (Bel Air)	c1956
K-430	1972-1973
K-45	c1949
K-45 (Riviera)	1949
K-48	c1956
K-4c	1959-1960
K-5	1956
K-50 (Mayfair)	1950
K-51 (Executive)	1954
K-55 (Mayfair)	1950
K-56 (Executive)	1954
K-609	c1966-1967
K-610	c1966-1967
K-612	c1966-1967
K-614	c1966-1967
K-615	c1966
K-616	c1966-1967
K-620	c1965
K-622	c1966-1967
K-623	c1966
K-625	c1966
K-7 (Zoom)	c1960
K-700	c1963-1964
K-710H	c1970s
K-714H	c1970s
K-714H (Vista Zoom)	c1963
K-715P	c1970s
K-716P	c1970s
K-771	c1963
K-773	c1963
K-773L (Americana)	c1963
K-774	c1963-1964
K-774L	c1963
K-776	1963
K-776L (Regal)	1963
K-7D (Zoom, Deluxe)	c1960
K-8	c1935-1936
K-808	1963
K-810	1963
K-811 (Zoom Reflex)	1963
K-825	c1963
K-828	c1963
K-851	c1964
K-852	c1964
K-8c	c1963
KA-1	1959
KA-1A	1959
KA-1C	1959
KA-1D	1959
KA-3	1959
KA-K	1959
Le Clic (disc)	1982
Le Clic (flash)	1998
Le Clic EverFlash	c1998
Le Clic Tuff Underwater	c2000
Message Camera 470PM	c1997
Model C	c1930-1931
Pocket EverFlash 105	c1977
Pocket EverFlash 106	c1970s
Pocket EverFlash 110	c1974
Pocket EverFlash 120	c1974
Pocket EverFlash 130	c1974
Pocket EverFlash 140	c1974
Pocket EverFlash 305	c1974
Pocket EverFlash 310	c1975
Pocket EverFlash 405	c1975
Pocket EverFlash 410	c1977
Pocket EverFlash 710	c1977
Pocket-Matic 10	c1974
Pocket-Matic 101	c1974
Pocket-Matic 20	c1974
Pocket-Matic 202	c1974
Pocket-Matic 303	c1974
Pocket-Matic 404	c1974
Regency	c1980s
Wizard XF 1000	c1977
Wizard XF 1500	c1977
XL 100	c1976
XL 200	c1982-1982
XL 204	c1973
XL 300	c1973
XL 500	c1980
XL 727	c1976
XR 33	c1980s
XR 44	c1980s
Zoom 66	c1978