If the J is at the beginning of the serial number then it's part of the number. It would indicate that it was in the 110,000 98K made in that year by that company. An example of Germanicon serial numbers would start with A01 and every 10,000 they would then change the letter to the next such as B01. The very first string would not have a letter and would be 01. When they went through the whole alphabet then they would start at the beginning bit would use a small a then b then c with the numbers till the year ended. The next year they would start again with the capital A.