Minerva. A large and unusual 18K gold hinged single button chronograph wristwatch with enamel dial and pulsometre scale

Minerva. A large and unusual 18K gold hinged single button chronograph wristwatch with enamel dial and pulsometre scale
Signed Minerva, movement no. 1'273'641, case nos. 4R 2 and 1'273'641, circa 1925
With nickel-finished jewelled lever movement, the white enamel dial with black Arabic numerals, blued steel spade hands, inner red 13 - 24 hour divisions, outer five minute divisions and pulsometre scale, two subsidiary dials indicating constant seconds and 30 minutes register, in large circular case with wire lugs, hinged back, large ball-shaped crown, one rectangular chronograph button in the band, case and dial signed, movement numbered
45 mm. diam.