Master negative of a 3 metre LogMAR chart

Historical Significance: The LogMAR visual acuity chart took the ophthalmic world by storm when it was invented in 1975 (see Bailey IL, Lovie JE. New design principles for visual acuity letter charts. Am J Optom Physiol Opt. 1976; 53: 740-745.), The research behind the development of the LogMAR charts was done by Bailey and Lovie in the National Vision Research Institute of Australia (NVRI). Charts constructed to its principles are now widely adopted, especially in low vision clinics and for clinical trials. The original chart was very large, 750 x 1000 mm, and cut-down less cumbersome versions were devised. The NVRI where the original LogMAR chart was devised produced a number of variants under the leadership of Professor Robert Augusteyn, when he was Director of the NVRI from 1991 to 2001. A 3 metre chart was one of the variants. Others were the Paediatric chart (with symmetrical letters to avoid letter reversal) and the hi-lo contrast chart. The date and origins of this item are uncertain because of the lack of identification information on the item. Professor Augusteyn advised November 18 2015 that he knows nothing of it.