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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 ↗
                
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                    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 17982. 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 17983
            
            
                
                    Senegal                    P                                    
                                    Related lotRelated to Lot 17982 · Same country / area · Imperforate
                                                
                    
                    
                                                
                        Ask a question about Lot 17983
                        
                        Answers separate UPA catalogue facts from general philatelic guidance.
                    
                                    
                                Medicinal Plants. IMPERF PROOF SHEETS of all 4v, UM, without gum.
                                    
                        Philatelic terms
                        
                                                            
                                                            
                                                            
                                                    
                                                    
                                UM — Unmounted Mint
                                A mint stamp with original gum that has not been mounted or hinged.
                            
                                                    
                                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.
                            
                                                General philatelic guidance — separate from the UPA catalogue description.
                    
                                
                    Date
2001
                    SG
1639-1642
                                    
                
                    
                        Estimate
                        £12.00
                    
                    
                        
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