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Club Information Map Information Buy/Sell/Trade Maps Miscellaneous
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Jeff Koenker provided the following information. Over the years RM appears to have used a number of "systems" to date their maps. All variations may not be explained here---but most maps should still be able to be dated. One big exception, in the 20's some RM maps have no letters or numbers at all and these must be dated by comparing to known dated maps. First, RM used a simple letter code, A for 1919, B for 1920, through Z for 1944. However, some of the years prior to 1944 numbers began to appear after the letter. If the set of numbers has 4 digits, the first 2 digits indicate the year the base map was drafted while the second 2 digits either indicate the year the first RM map was made of the area (the original base) or simply a code for the area covered. The latter seems more likely except that it limits RM to 100 areas. If only 2 digits exist after the letter, they seem to be a code for the area. These codes can usually be found on the very bottom of a RM map either on the left or right. They are often "hidden" on the map itself on the bottom rather than in a border where they could be easily found ;-) Now, after 1944 the letter was replaced by a 1 or 2 digit year preceding the above series on digits and often separated by a hyphen. from 1945 to 1965 only the last digit of the year was used. To distinguish 1945 from 1955 from 1965 generally requires common sense -- look at the census date if given, interstate highways, etc. From 1966 to present, the last 2 digits of the year are used. Example: Example: Now to all this may be added a letter N, S, E, W, or even V for North, South, etc. when only a portion of the base is used. The V stands for a Velox print (?). Example:
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