In 1909, K&D build numerous versions of its staking sets. Each version filled a specific need. The text in this advertisement explains the advantage of two features the company offered.
The Text Reads:
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Ball bearing bases are popular because their many good qualities – their weak point being that no adequate hold is afforded by which they may be lifted from place to place on the bench; it is always necessary for the watchmaker to use both hands.
The new handle completely removes this difficulty; it is neat and strong; fastened to the base by three substantial steel screws, inserted from the inside, therefore, invisible. These handles fit any K.& D. ball bearing base, but should be attached at the factory.
The standard staking sets came in either a wooden box or the dome covered round bases of which three existed. Variations of the following sets came with these frames:
Inverto No. 17
Inverto No. 18 with On or Off Punch sustaining Device
Inverto No. 17 A and 18A on ball bearing bases
New Design, but not Inverto: No. 12B, 13B, 14B, 15B, 16B
Without die binding and friction sleeve: No. 5 and 5B
The 16A & 16B used the punches you may find with a letter preceding a number. For example,
A 1 Stretching balance arms
B42 Flat Faced Hollow Punches
C79 Taper Mouth Closing Punch
The lettered punches are longer than the Inverto punches, e.g., No. 44. K&D had to shorten the punches to work with the Inverto frames.