Collecting antique glass: determining age (part 1) of early 1800s to mid 1900s drinking glasses

I share my thoughts on dating pieces from the tool marks on the base including rough pontil, ground pontil, T-mark, swirl, and raised 'button'. Most pieces from 1800 onward will display one of these features. I don't talk about pre-1800 pieces. I am not an expert, so take this as my opinion only. Note that this video does not apply to decanters. Decanters exhibit ground pontils even into the 20th century. Decanters are dated by the rim/neck and general style.

Part 2: https://www.youtube.com/watch?v=hjbHanrxcvU&feature=youtu.be

Part 3: https://www.youtube.com/watch?v=mb0eSQ5VfeE&feature=youtu.be
Links:

Video showing Gadget and late victorian style technique: https://www.youtube.com/watch?v=tVc7JkYeH5U

Notes on Pontil and T mark ages: http://theworldismadeofglass.co.uk/index.php?main_page=page&id=2

Seeds and stones (and pontil discussion):
http://antique-marks.com/support-files/antique-marks-georgian-glass-2.pdf

Other info on stems/styles etc:
http://www.great-glass.co.uk/glass%20notes/drink.htm#FEET

Book: The Hallmarks of Antique Glass, R. Wilkinson, 1968, Richard Madley LTD London.

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