I've made several postage stamp quilts with strips cut at 1=1/2" strips sewn into 4-strip blocks. Finished postage stamp blocks are 1". I always thought all postage stamp blocks were finished at 1". If I'm wrong, let me know! Also, my understanding is that a charm quilt is constructed with all blocks identical (any size) and with no repetition of fabrics. If someone knows otherwise, please let me know.