The "Stock Block" line is used to identify the batch of stock reported on Form 7203. The description is not important to the IRS, so use something that is useful to you - number of shares, date of purchase, etc.
Since you purchased stock at separate times, you would have one Form 7203 for each batch of stock. Both copies must be provided to the IRS.
Form 7203 is available for e-filing as of April 10, 2022.
[Edited 4/11/2022 | 6:43 AM PDT]
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