Sign Instance
GET /data/api/signs/208/?format=api
http://labasi.acdh.oeaw.ac.at/data/api/signs/208/?format=api", "sign_name": "ŠUL", "abz_number": "467", "meszl_number": "744", "image_1": "http://labasi.acdh.oeaw.ac.at/media/sign_img/shul_467_5dPM8aD.jpg", "image_2": null }{ "url": "