This is the smallest tuning fork movement ever made and is usually found in ladies watches. It has no second hand.

The UK 5p piece measures 18mm in diameter. Unlike the 230 Series, this one still follows the original 214 design of coils-and-cups.

Bulova Accutron 2210 (1974)

Bulova Accutron 2210 with a UK 5p piece (18mm in diameter)

Bulova Accutron 2210 with a UK 5p piece. No second hand on the 221 Series.