Monday, February 04, 2019

Counterfeiter Daniel Johnson

A story in the LA Times by Del Quentin Wilber includes photos of the counterfeit $100 bills produced by Daniel Johnson. The Secret Service seized fake bills with a face value of $300,000 from Johnson's counterfeiting plant and home.

The counterfeiter was killed in a shootout with US Marshals in May 2018.

Friday, January 25, 2019

Dr. William H. Sheldon, Ted Naftzger and the Large Cent Thefts.

John Kleeburg's lecture on the large cent thefts at the ANS last year. 70 minutes.

Monday, January 07, 2019

Copyright has expired for US books from 1923

After many extensions, US books printed in 1923 are now out of copyright. This week the Internet Archive made 33 numismatic works from 1923 available.

1923 wasn't a stellar year. The works are mostly auction catalogs. Included is Henry Chapman’s Ancient and modern foreign and American gold coins collected by the late Enrico Caruso, the sales catalog of the opera singer's coin collection.

No illustrations. This is the copy from the American Numismatic Society library. The catalog is 'priced' (sale prices recorded in the margins).

Tuesday, October 30, 2018

Laser cleaning of ancient coins

Briefly noted: An 8-year-old paper by Eleni Drakaki, Andreas Karydas, et al: “Evaluation of laser cleaning of ancient Greek, Roman and Byzantine coins”. Successful results are claimed, sometimes in conjunction with mechanical cleaning.

The article is a followup to an earlier paper, “Laser cleaning on Roman coins”. The image for this post comes from the first paper.

Monday, September 24, 2018

Three-dimensional reconstruction of Roman coins from photometric image sets

Three-dimensional reconstruction of Roman coins from photometric image sets”, a 2017 Journal of Electronic Imaging paper by Lindsay MacDonald, Vera Moitinho de Almeida, and Mona Hess.

The present study combined two datasets representing the surface topography of the two Faustina coins (Fig. 1). First, they were scanned by a 3-D color laser scanner, producing a point cloud of the surface shape. Second, they were photographed in an illumination dome with directional lighting. The two representations were combined to produce a digital elevation map (DEM) of each coin with the accuracy of the scanner and the fine detail of the photography.

Tuesday, September 18, 2018

The Insane Million Maker Master Counterfeiter

Good documentary storytelling on counterfeiting: Snap Judgement recently made a 22 minute segment about Frank Bourassa, a Canadian who counterfeited a quarter of a billion US dollars in twenties in 2009.

I calculate that $200,000,000 in $20 bills would weight 10 tons and would completely fill a 12' moving van.