It's pretty safe to say that from 1917- 1927 .... A mere 10 years....that this Keaton material is super rare, heavily sought after and very expensive....a nice combination....
I would like to amend some info and add some more:
1. Leonard Schrader didn't sell to Osian's ....his estate did...for 30 years he hid his buying habits and although he was active in the hobby and apparently acquired this material from many dealers....I think they found a perfectly documented partially hidden archive of black portfolios after he died...apparently no one knew he had 8,500 lobby cards from the silent era and early talkies...from 1913-1937... Plus 5,000 related window cards, posters, stills and slides...it was 189 Keaton lobby cards and window cards that really blew everyone away....complete sets and some doubles of all the best full length silent classics ...the general, our hospitality, college, the navigator, steamboat bill Jr. Etc..And a complete set of Dracula lobby cards and window card!!
2. As soon as you get into the 1930's the gold standard for classic comedy posters, lobby cards etc. becomes the paramount Marx brothers material, early Columbia 3 stooges material with curly and the early Laurel and hardy posters ....Keaton value drops off sharply after 1930
3. Morrie undoubtably had one of the better Keaton collections....I'm not sure what exactly Ron Moore or mike or kev or marty or mike h. All have but together they hold a shitload of material....so there isn't really much available....Heritage was consigned some of the very best early Keaton short comedy material Pre 1925 from a silent film estate find that included complete sets of The Playhouse, the electric house and assorted other cards....they were in remarkable condition...I am not sure where Heritage got the General, college and Steamboat bill Jr. Cards that they sold over the past year...but they appear to be sets from a single find....I was lucky to win some of those cards
In any event these past 3 years have been really epic for collecting Keaton ....so much fresh to market material in such a short time....certainly better than 2003-2013.....I can't wait to see what the next find will bring!!!