Judging from Swami Vivekananda’s appearance, this photo seems to have been taken around the same time as Sri Ramakrishna's death

Shortly before Sri Ramakrishna gave up his body at Cossipore, Swami Vivekananda had an exalted spiritual experience there. Seeing him Sri Ramakrishna said: “Now then, the Mother has shown you everything. Just as a treasure is locked up in a box, so will this realization you have just had be locked up and the key shall remain with me. You have work to do. When you have finished my work, the treasure box will be unlocked again; and you will know everything then, as you did just now.