ROMA FERROVIA 19.09.1877
Inverted Killer.
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The Bollatrice of Enrico Dani
Both stamps of the Dani machine were separately removable, which was indicated, for example, by inverted impressions. Vaccarri mentioned that some post offices (Ferrara, Siena and Treviso) had replaced the "large circle date stamp" with a "squared circle date stamp".
Guglielminetti mentioned that the special cancellation for World Exposition 1906 which he numbered as 07/1906 and 11/1906, were done between August and November 1906 by a "Duplex" cancelling device and resulted in two always properly aligned strikes. The cancellations Guglielminetti pictured are two, at first glance identical, "squared circle date stamps" inscribed "Milano Esposizione (1)" und "Milano Esposizione (2)". There are no indications that these imprints were done by a Daguin cancelling device, since the characteristic 28mm distance between the centre of the cancels is clearly out of range with 32-35 mm. Compared to the Daguin device, where the cancellations always were at a fixed distance, but mostly "non parallel", the Dani device seamed to have had the capability to fix the stamps so that its imprints were always parallel.
These rare combination of a bar numeral and a squared circle was applied 1896 in Siena.
Similar cancels are known e.g. from Trevisio.
The 28mm distance was measured in a series of duplex cancelations of "squared circle date stamps" from the 1890s, especially from Firence Ferrovia, but also from Napoli Ferrovia and Genova Ferrovia.
Ornaghi identified the special stamp for the "Esposizione internaz. Milano 1906", which Guglielminetti identified as PseudoMec, as "Boll. OED a mano". I assume Ornaghi was wrong, but confusion with the identical design, but longer cancellation from the Bickerdike machine can be excluded since both authors show this also. The multiple stroke example shown at the end of this article indicated that the Bollatrice Dani was used in 1906, and this was possibly electrically driven.
In the years after 1900 there were also combinations of a "large circle date stamp" with a "squared circle date stamp".
This multi stroke let assume that it was possible to attach a electric motor to the Dani machine.
