Rare and complicated triple-date calendar chronograph with moonphase by Gander Watch Co. The case and the back are both marked and made in massive 18kt gold with hollow lug case design (to reduce the amount of gold used). To add strength to the gold case a metal ring is a spacer is present, normal strategy to fit smaller movements into larger cases. The case is large measuring 38mm in diameter not including the crown, 47mm lugs tip-to-tip. The watch keeps excellent time and functions properly since it has been serviced in 2018. The movement is a genuine Landeron 186 manual-wind chronograph, 60s, 30/45min, cam switched, sub second, Tag, pusher at 10h, date hand, pusher at 9h, month, pusher at 2:30h, moon phase, pusher at 8h, 17 jewels, f = 18000 A/h and power reserve of 41h. Case condition: remnants of wear to the back and previous signs of polishing on the inner part of the gold back case. Presents on the wrist as just short of mint. Band: brand new and unworn, fit wrist size up to 8" Crystal type: Acrylic, excellent condition Insured shipping.