Good Doogs — Marble Identification & Catalogue

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A photo works; a few photos from different angles or a short video slowly rotating the marble works better for cut lines/seams — the app reads them together automatically.

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Measured size (optional — calipers or a ruler)

Seam on a patch marble (optional — look at the equator)

What can you see?

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Name or working label Maker Catalogue entry Size Buy price (optional)

Condition (grade) Precise grade (optional, 0.0–10.0) Provenance (where, when, from whom) Notes

What you spend

Every purchase in your tracker, by channel. Whatnot is where the volume goes; eBay is where the money goes per item.

Spend by month

What the market pays

Sold prices from eBay Australia, read 30 Aug 2026, in AUD. Split by what was actually being sold: one marble, or a lot. Switch between them — they are different markets.

middle 50% of sold prices full range your median paid

Your orders are in USD. Convert at USD 1 = AUD — an assumption you control, not a live rate

Buy the box, or build it?

A marble bought inside a lot costs a fraction of the same marble bought on its own. That gap is the real price of assembling a set one marble at a time — worth paying when you need a specific named run, worth knowing before you start.

Assembling marbles of

Does original packaging pay?

Lots whose title mentions an original box, bag, net or card, against lots that do not. Treat this loosely — a title is a poor proxy for packaging, and a row built on two or three sales tells you nothing. Counts are shown so you can see which rows are worth reading.

Full numbers

Every segment as figures. A count of 240 means the search hit eBay's page limit, so the true number of sales is higher and these are the most recent 240.

Adding a comp

Run a sold search on eBay, then ask Claude to read it — it will return these figures already split into singles and lots.

Marble condition grading guide

Researched 17 Sep 2026. This is the scale the marble-collecting hobby actually uses — confirmed matching, on the same 0–10 numeric scale, across three independent sources: marblecollecting.com (the Marble Collectors Society of America's own grading guide), Block's Marble Auctions' published grading scale, and buymarbles.com's collector FAQ.

Mint (9.0–10.0) — original, unmarked, undamaged surface. Minor factory characteristics (an air hole, a melt mark) don't count against the grade — those are "as-made", not damage. Light surface rubbing from age is fine.

Near Mint (8.0–8.9) — minor play/handling wear: a pinprick chip, a tiny subsurface "moon" (a lens-shaped fracture under the surface), or a small flake. Damage is minimal, usually confined to one side.

Good (7.0–7.9) — clear, numerous wear marks: chips, flakes, subsurface moons, bruises. The pattern/core is still fully visible despite obvious play history.

Collectible (below 7.0) — extensive damage that obscures the core in places. Worth keeping only as a placeholder until a better example turns up, or if the piece is rare enough that any example matters.

Altered surfaces (no numeric grade) — a buffed/polished/remelted/reworked marble is a different, much lower-value category from an ungraded original, whatever it might otherwise have graded: Buffed is a light polish removing minor haziness (handmade pontils usually survive; machine-made often shows exposed air holes and colour shift); Polished is a heavier polish removing damage outright (handmade pontils disappear); Remelted is torch/furnace heat reflowing the surface smooth (subsurface bubbles, slight rippling); Reworked is remelting plus added glass to fill damage (rare, mostly certain handmade types).

Why it matters: even a small chip can cut a machine-made marble's value by more than half, because so many survive in top condition that buyers are unforgiving. Collectors are noticeably more forgiving of the same damage on a handmade marble, since good handmade examples are harder to find. Condition swings price more than almost any other single factor once you're past correct identification.

Sources: marblecollecting.com (MCSA) grading guide · Block's Marble Auctions · buymarbles.com Marbles 101/FAQ

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