Well I don't keep up with all Accutrons movement variants and mainly own 214 movement models but there are at least two Accutron variants in the Caliber 218 that have the battery disconnect feature:
This version still has the standard component coil assy, however, the pillar plate hole which receives the ground-plate screw has been replaced by an insulated bush. Thus the screw is now isolated electrically from the pillar plate. The standard ground screw is replaced by a longer gold-plated one which has a tip that projects through the other side of the pillar plate and insulated from it. This forms one of a pair of contacts. The other contact is made of a gold-plated spring which is attached to the pillar plate. These contacts are operated by the setting lever. The design of the moving contact seems to me to be a bit "back yard". It is crimped into the pillar plate, and if it should break, the the entire pillar plate would have to be replaced. See pics above.
The effect of this contact mechanism is to form an electrical disconnect switch to stop all current flow when the crown is out. This means the watch could be stored in setting position, without draining the battery."
The Model 218G and its variations was made by both Bulova and the Citizen Watch Co. in Japan. Bulova owned a large share of Citizen between 1970 and 1975. Citizen supplied parts to Bulova during these years. For what models I am not sure, but at least for the 218 and probably 219. The 218 parts are perfectly interchangeable between the Japan and USA built movements, and the level of finish is identical. The Japanese built 218's can be identified by the stamp "Lic. Bulova" instead of "US Pat xxxxxxxxxx et al". This can be found at the very top edge of the mainplate, between the two coils. With this model, Bulova changed the hack system again. They dropped the idea of the stop collett on the hack lever, and went back to the old hack pin idea, which as before, lifts the pawl finger off the index wheel. The component coil assembly was modified again from the standard type, and the ground plate was deleted. Instead, a contact plate was fitted to the underside of the plastic molding, and this projected through a hole machined in the pillar plate. The original ground screw position was retained, but its only purpose was to serve as a mechanical mounting point.
In this new machined hole in the pillar plate, a contact spring was fitted (different to the 218F type). These two contacts were operated by the setting lever (modified yet again to suit). Also, the setting lever now has 3 positions, ie, the crown has 3 positions - in, middle and out. In the in position, the watch runs normally. In the middle position, the hack works, and the watch can be set. In the fully out position, the battery is disconnected, suitable for storage.