There have been cases of lowlife scumbags putting DOC on fake Hofmann mountain blotters, but the real Hofmann mountain/bicycle blotters have always been very high quality LSD. Most variations on this print have been laid around 150mcg according to reliable sources. The "Original" sheets (with "Original" underneath the mountain and a misdrawn LSD molecule on the back) were purportedly laid at 250mcg. Very experienced old heads will confirm that these dose estimates are likely correct and the quality of the acid is first rate.....
Real Hofmann's are thick, larger hits than usual with the full image printed on every 5x5. They tend to taste a bit soapy or sometimes bitter depending on ink. But they are very high quality LSD if real.....