Jack Taylor bikes (tandems included...) use a consecutive frame number there is no date code. Unfortunately I don't have any frame number/confirmed dates of sale to plot what age your tandem is.
Regards Hilary Stone
----------
>From: <siverson@garlic.com>
>To: <classicrendezvous@bikelist.org>
>Subject: [CR]Jack Taylor Tandem -- age?
>Date: Mon, Mar 19, 2001, 1:34 am
>
> I bought a used Jack Taylor tandem. It came with: TA cranks, Phil hubs
> and diskbrake, Weinman concave rims, Cinelli new logo bars & stem,
> Mafac cantilevers, NR seatposts, Rallye rear deraleur, SR front. The
> original silver paint with box-striping is still quite nice as are the
> transfers.
>
> The number stamped on the rear dropout is: 7640.
>
> I'm guessing this is probably a 1976 bike but would like to get an
> exact date on the frame if possible. Any ideas or suggestions would be
> appreciated.
>
> Thanks
> Erik Siverson
> Gilroy, Cal