HUXLEY DOLLAR - 2-COIN .999 FINE SILVER SET - LASER ENGRAVING FILES
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Same art as the copper rounds (../commemorative-1oz, ../celebration-200); only the small inner
legend changes from "1 OZ .999 CU" to "1 OZ .999 AG". Blank: 1 oz .999 silver round, 39 mm.

FILES (vector, millimetres, 1:1 - do NOT scale; viewBox 0 0 39 39, disc centre 19.5,19.5)
  silver-first-doge-front.svg / _engrave-only.svg   FRONT, First DOGE feather coin
  silver-200-front.svg / _engrave-only.svg          FRONT, 200 Cheers coin
  silver-back-qr.svg / _engrave-only.svg            BACK for both coins (unchanged QR art)
  silver-first-doge-front-back.pdf                  page 1 front, page 2 back, 39 x 39 mm each
  silver-200-front-back.pdf                         page 1 front, page 2 back, 39 x 39 mm each
  silver-200-preview.png, silver-first-doge-preview.png   front + back renders (+ -small.jpg)
  silver-set-preview.png                            both fronts side by side (+ -small.jpg)
  silver-*-front-flat.png                           flat black-on-silver fronts
  make_silver_first_doge.py, make_silver_200.py, make_silver_preview.py, verify_qr.py, fonts/
  Layers as before: "ENGRAVE" black = mark; red "CUT GUIDE - DO NOT ENGRAVE" = alignment only.
  Every mark and gap >= 0.30 mm; nothing marked beyond r = 18.5 mm (1 mm bare rim).
  QR: version 2-M, 25 x 25, module 0.727 mm, 24 mm with quiet zone, encodes https://huxleydollar.com

SILVER NOTES
  - A fiber laser darkens silver differently than copper. Fine silver is highly reflective and
    conductive, so a surface mark is harder to get dark. Two usual routes:
      (a) black "annealing"/oxide mark: slow, high-frequency passes that darken the surface, or
      (b) a shallow deep-engrave filled with black (paint/enamel/oxidiser) and wiped back.
    Run test marks on scrap silver first; the QR modules must come out evenly dark.
  - Test-scan the QR with a phone on the first piece before running the batch.
  - Finish: clear-coat (lacquer / clear enamel) both faces to keep the silver bright and the QR crisp,
    or skip the clear coat if natural toning is wanted (toning darkens the bright silver over time
    and slowly lowers QR contrast).
  - The previews show a subtle antique toning on the outer rim only; it is kept out of the QR
    and its quiet zone. It is a look, not an instruction.