The Kuzel Lamp
Collectors of early electric incandescent lamps in the United States tend to mainly look for lamps made at home. However, some types of lamps were made in other countries and imported to the States. Thus, such a lamp would be more collectible in that case. One such lamp was known as the "Kuzel." Two articles that describe this lamp follow1:
"The 'Sirius Colloid' lamp, as Dr. Kuzel prefers to call it, is now commercially manufactured at Vienna, Furstenwald-bei-Berlin and at Niukoping, Sweden, and it is stated that active preparations are making for its production in other countries. It has been actively taken up in Europe by Pintsch Brothers, whose names are so widely known in gas lighting, and who are making the lamp in Germany, in rapidly increasing quantities. At present lamps of 25 candle-power, 25 watts per lamp, are made almost exclusively, although 50 and 100 candle-power lamps have also been supplied to meet a limited demand.

"The Kuzel filament differs from the tungsten and other specific metal or alloy filaments in that its material is obtained by a process of reducing the metals employed to the colloidal state, thereby producing filaments of the requisite dimensions and electrical accuracy, and also of the required chemical purity and at the same time within a reasonable commercial cost.

"Lamps have been made for burning in any position, but up to the present are available commercially in only the simple form adapted to pendant burning alone. The processes of mounting and exhausting are easily performed, but are not the same as those used in the manufacture of carbon lamps. The lamp is shown in the accompanying illustration."

A little over a year later a second article appeared2 concerning the Kuzel lamp:
"The Kuzel lamp continues to make substantial progress, and although it is not yet manufactured in this country, negotiations are progressing toward that end. In the meantime increasing quantities are being imported, as the European manufacturers are able to spare lamps for this market.

"This lamp has been standard in Europe for some months, and burns in any position. The standard candle-power is twenty American candles, twenty-five watts, for the 110-volt lamp. This type of lamp is made almost to the entire exclusion of the higher candle-powers.

"The lamp is rugged physically, which is due partly to the ingenious anchoring employed, but principally to the superior quality of the filament itself. The colloidal process employed by Dr. Kuzel produces a filament of perfect homogeneity and great elasticity, as well as purity.

"The lamps at present are made in bulbs of practically equivalent sizes to those used for carbon lamps of corresponding candle-powers, and are fitted with the same style of base as is used on all low-candle-power carbon-filament lamps.

"The Kuzel lamps are now manufactured in Austria, Germany, Sweden and Great Britain, and the solidarity of the business is typified by the new factory which has been erected in Vienna. This factory, which is being operated by Kremenezky, has a present capacity of 25,000 lamps per day. Every precaution has been made to increase the plant and equipment to 60,000 per day as rapidly as it may be necessary. Kremenezky has been recognized for years as the leader in high-class carbon-lamp manufacture in Europe, and he has naturally devoted his best energies to the equipping of the new tungsten-lamp factory with the most perfect machinery that has been developed for tungsten-lamp manufacture up to the present time."

It can be seen on this website that W. J. Hammer had Kuzel lamps that were made in 1906, 1907, 1908 and 1911.

References
1) "Kuzel One-Watt Colloid Lamp," Electrical World, Vol 49, No 22, Jun 1, 1907, pg 1126.
2) Paul M'Junkin, "The Kuzel Lamp," Electrical Review, Vol 53, Sep 12, 1908, pg 403.