Nice clean work John, it's coming along beautifully.
Geo, I'm not 100% certain, but I think the Tamiya thin was the original thin, liquid cement, before the introduction of extra thin, the latter having a green cap and pale green label.
The liquid cement, in a clear bottle, with white cap and white label, is as John described, and though thinner than 'tube' cement, it does not perform in the same way as the extra thin.
I haven't seen the Tamiya thin in the UK for some time, but from memory, it would fall in between the extra thin, and the white label liquid cement, and was similar to the original Humbrol liquid cement.