u/Suitable-Key2224

The counterfeit coin problem is getting out of hand, especially with raw Morgans and key-date coins showing up everywhere online, flea markets, antique stores, and local tables.

Most people are not carrying around a Sigma, magnet slide, or coin guide everywhere they go, but almost everyone has a phone in their pocket.

I’ve been working on a simple visual comparison system that checks whether the fonts, spacing, and major design features line up with known genuine examples for that exact date and mint.

Yellow indicates a strong match. Blue is usually just wear or circulation friction. The important part is looking for obvious mismatch areas, major red zones, incorrect lettering placement, spacing, or design details that do not line up correctly.

Not meant to replace professional authentication, just a quick first-pass sanity check for everyday collectors before spending money on a coin.

The counterfeit coin problem is completely out of hand, especially with raw Morgans, Walkers, Trade dollars, key dates, and better-date type coins showing up everywhere online, flea markets, antique stores, and local tables.

Most people are not carrying around a Sigma, magnet slide, reference books, calipers, or years of experience when they run into a coin in the wild. But almost everyone does have a phone in their pocket.

Here is a simple visual comparison system that checks whether the fonts, spacing, and major design features line up with known genuine examples. This is just a proof of concept

This is an example of a clean match:

https://i.postimg.cc/02xbdtFk/Screenshot-from-2026-05-17-17-48-59.png

Yellow areas indicate a strong match. Blue is usually just wear or circulation friction. The lettering and design details line up very closely with known genuine coins. Minor wear can create some blue/green areas.

The important part is there are no major red blotches or mismatch zones.

https://i.postimg.cc/XvZJ7tGy/Screenshot-from-2026-05-17-17-13-57.png

https://i.postimg.cc/QddCvFjP/Screenshot-from-2026-05-17-17-14-21.png

Again, the reverse design and lettering line up closely with known genuine 1893-S reverse details with only light wear showing.

This is not meant to replace professional authentication or grading. The idea is more of a quick first-pass sanity check for everyday people. If something is obviously off with the date position, lettering, spacing, mint mark area, or major design elements, the scan should make those mismatch areas stand out quickly.

Honestly, the number of fake coins entering the market now is getting to the point where collectors probably need some kind of fast mobile screening tool.

Need help from a few people with non slabbed coins and android phone.

I don't have access to cool coins and can't test errors without real coins. Figured this is the best place to ask.

Delete post if it a problem.

Last night was able to combine error category by side and category... Just don't have any error coins to test.

If you are already testing the app, update are automatically sent by Playstore

That time you had one job at work and yet they spend the next 40 years documenting your mistakes.

Combined all my coin references into an app to help me remember what coins have what errors