Gooser - the tangs in the first two illustration would have run into the blade without a definite heel being present. It is only plenty of subsequent honing that has produced apparent gap between blade and heel as in fig. 1,
The third razor has a totally different tail shape. So that rather rules out 1810 - 1835 in my humble estimation. From the rest of the pics, 1835 0nwards look close.
However, I do not necessarily agree with the datings of those pics, nor do I agree that there were not a variety of shapes present at all periods - look at today's razors, you get some space-age looking ones, some 1940s-50s looking ones and some very early looking ones - all in the same decade, and some of those shapes have been around for 75 years or longer, so in my opinion it is very brave to hazard a date without having the full makers history, whether he acquired his mark from some one else, or whether his mark was acquired by someone else....
I'm not trying to derail the thread or anything, just pointing out some of pits you can fall into and the other hazards that accompany armchair research :)
Regards,
Neil