Hi Anne,
There is nothing in the records to say whether or not the moulds used by Davidson had the Krys-tol mark in them. I do not believe they did for a number of reasons:
1) Very little Chippendale glass in the UK has the Krys-tol mark - this suggests that most of the production, whether by Davidson or before, did not have the mark.
2) The Krys-tol mark only appears in the early adverts. I have not been able to check all of my notes from the Pottery Gazette, but a 1911 advert uses the Krys-Tol name, but the next one I can find in 1923 does not. None of the later adverts use the Krys-tol name.
3) If the glass were marked 'Krys-tol', but was being advertised as Chippendale, then this could confuse the buyer - what have I been sold Chippendale glass or Krys-tol glass. Therefore I would assume that if the Krys-tol name was not being used in the adverts then it did not appear on the glass.
4) The examples of Chippendale glassware which have an original Davidson label of which I am aware are not marked Krys-tol.
5) The Davidson Chippendale catalogue of 1935 does not mention Krys-tol.
If the above logic is correct, then it means that very early on (pre 1923), the moulds from which the English Chippendale glassware was made did not have the Krys-tol mark.
Regards
Chris