Tool collection

← Whole collection

Auger bit with an unidentified shield mark, No. 4 — Photo 1

Bits

1900–1959

Auger bit with an unidentified shield mark, No. 4

Item passport

Dating
Roughly the first half of the 20th century (about 1900–1950s), with wide uncertainty; no specific year or decade is confirmed.
Condition
Signs of age and wear; part of the stamp is incompletely preserved. No result of a test drilling has been reported.

Dimensions

  • Length190 mm

Wood auger bit with a screw lead and square tang for a hand brace, card no. 4. Overall length 190 mm, mass 45 g. Diameter not measured or confirmed; the digit stamp on the tang was earlier read as "70" or "10". The shank carries a stamp in the form of a…

Read the story

History

Wood auger bit with a screw lead and square tang for a hand brace, card no. 4. Overall length 190 mm, mass 45 g. Diameter not measured or confirmed; the digit stamp on the tang was earlier read as "70" or "10". The shank carries a stamp in the form of a shaped shield / elongated oval: a short inscription above, presumably "SCH…NG", below "BO…R" (possibly "BOHRER"), and an illegible figure in the centre.

Dating. Roughly the first half of the 20th century (about 1900–1950s), with wide uncertainty; no specific year or decade is confirmed.

Marks and stamps

  • unattributed

  • unattributed

Restoration

The owner cleaned the bit with WD-40 and fine 0000 steel wool, then applied ISO VG 68 oil to protect the metal.

Sources

Research status

Attribution is preliminary; the maker and country of manufacture are not established. The upper inscription is only partly legible; the reading "SCHLANGEN" was rejected as not fitting the space on the stamp. The lower inscription may be "BOHRER" (German for "bit"), with partly damaged letters. The central figure (an emblem, a person or an object) is not reliably identified. Marks considered as research leads: Schellenbohrer (August Friedrichs), Bohrer-König (Mühlhoff), and the makers Heller and Schönenstein; none is confirmed by a visual match of the stamp. Confirmed: the form of the tool, length, mass, circumstances of acquisition, conservation. Not confirmed: maker, exact inscription, symbol, diameter, year of manufacture and market value. Bought in Königswinter, Germany, together with a Flott hand brace; the bit was held in its chuck. The card is based on the owner's information and macro photographs of the stamp.

Purchase and price

Place of purchase and price are visible after signing in. Sign in