Reproduction fountain pen cap jewels
You know the ones. These are the harder ones to find. The transitional cap jewels have a threaded shaft. These are the 2nd generation version, with the domed top. The three-ridge version was simply not feasible as a replacement part, but these will fit all the clips for any of the versions of the transitional J pen.
Note that pricing is for ONE single cap jewel, but I do have quantities to sell.