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                Perforation-assisted identificationAlready know the stamp, country or SG reference? Add its measured perforation to narrow possible catalogue matches and help distinguish perforation varieties.Try UPA’s Digital Perf Reader ↗
                
                                                            Measured perforation
                    
                    Use this after identifying or searching for the stamp. Perforation is treated as one identification characteristic, not proof of identity or authenticity. Only perforation details explicitly recorded in UPA catalogue descriptions are matched.
                
            

            
                
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                    1
                    lot found                                            UPA103
                                    
                                    Catalogue closes October 6, 2026
                            

                            Related-lot discovery: showing stronger factual matches to Lot 5846. Distinctive philatelic features are prioritised over generic similarities such as format, condition or date; results are ranked locally from the full current UPA catalogue.
            
                            
                                                    
            
                                    UPA
                                Lot 5845
            
            
                
                    Estonia                    F                                    
                                    Related lotRelated to Lot 5846 · Same country / area · Similar period
                                                
                    
                    
                                                
                        Ask a question about Lot 5845
                        
                        Answers separate UPA catalogue facts from general philatelic guidance.
                    
                                    
                                (Oct-Nov) Air surcharges 10m imperf (3, one used) and perf (2, one used), 20m imperf (5, two used) and perf (3 mint, incl. vermilion surch.), plus 45m (3, one used), most (if not all) of stamps and cancels are FORGERIES, nice reference group.  Cat. £4000 if genuine. (16)
                                    
                        Philatelic terms
                        
                                                            
                                                            
                                                            
                                                    
                                                    
                                SG — Stanley Gibbons
                                The Stanley Gibbons catalogue reference used to identify and catalogue stamps.
                            
                                                    
                                imperf — Imperforate
                                A stamp produced without perforations separating it from adjoining stamps.
                            
                                                    
                                perf — Perforation
                                The rows of holes or cuts between stamps that allow them to be separated; measurements describe the spacing of those perforations.
                            
                                                General philatelic guidance — separate from the UPA catalogue description.
                    
                                
                    Date
1923
                    SG
46-8
                                    
                
                    
                        Estimate
                        £33.00
                    
                    
                        
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