The M101-5/4 cards were produced by Felix Mendelsohn and sponsored by numberous businesses to help promote their various products. The table below identifies all known back sponsors and variations. It should be strongly emphasized that for most sponsors these estimates are based on very small samplings of cards known to collectors (sometimes only a "handful" of cards or less). As a result, a small find of cards with these backs could significantly alter the relative population estimates. A much more detailed discussion of the various sponsors and the relative scarcity of each of these backs can be found in an article "Making Sense of M101-5 & M101-4 (Mendelsohn’s Trend Setter of 1916)" by collector's Tim Newcomb and Todd Schultz in Issue #16 (Summer 2008) of Old Cardboard magazine. Relative Population Estimate (%) M101-5/4 Sponsors ACC # Among Sponsors Between Sets M101-4 M101-5 (1) (blank back) - 40 75 25 (2) Altoona Tribune - 1 100 0 (3) Block & Kuhl - 1 75 25 (4) Bucyrus Brewing - * 100 0 (5) Burgess-Nash - 1 100 0 (6) Everybody’s (3 var.) - < 1 100 0 (7) Famous and Barr - 12 10 90 (8) Furniture City Brewing - * 100 0 (9) Gimbels (3 var.) - 2 90 10 (10) Globe Clothing H801-9 2 100 0 (11) Green-Joyce - < 1 100 0 (12) Herpolsheimer - 2 90 10 (13) Holmes to Homes - < 1 0 100 (14) Indianapolis Brewing - 2 100 0 (15) Mall Theatre - < 1 100 0 (16) Morehouse Baking D352 2 60 40 (17) Sporting News M101-4/5 20 100 0 (18) Standard Biscuit D350 6 35 65 (19) Successful Farming - 1 0 100 (20) Ware’s Basement - 2 100 0 (21) Weil Baking Co. D329 2 100 0 100

*Note: The Bucyrus and Furniture City Brewing cards are known only in sheet format and only one sheet is known for each. They are blank-backed with the sponsor label printed in the sheet border on front. They are not included in the population percentage totals. Also, because a Noon-Day Cafeteria back has not been confirmed beyond a photocopy of a single example provided years ago, that sponsor is not included in the backs checklist above.

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